[XEND] Updates to SR and VDI implementations

* Moved xenapi transport util method, stringify to xen.util.xmlrpclib2
* XenVDI now preserves configuration to an XML-ish file
* Update Xen API's class names to be all lowercase
* Update get_by_label to get_by_name_label and return sets as the API
  expects.
* Add support for VBD creation with a VDI reference.

Signed-off-by: Alastair Tse <atse@xensource.com>

tools/python/xen/util/xmlrpclib2.py

@@ -21,8 +21,9 @@ An enhanced XML-RPC client/server interface for Python.
 """
 
 import string
-import types
 import fcntl
+from types import *
+    
 
 from httplib import HTTPConnection, HTTP
 from SimpleXMLRPCServer import SimpleXMLRPCServer, SimpleXMLRPCRequestHandler
@@ -39,6 +40,23 @@ except ImportError:
     # package.
     ssh_enabled = False
 
+#
+# Convert all integers to strings as described in the Xen API
+#
+
+
+def stringify(value):
+    if isinstance(value, IntType) and not isinstance(value, BooleanType):
+        return str(value)
+    elif isinstance(value, DictType):
+        for k, v in value.items():
+            value[k] = stringify(v)
+        return value
+    elif isinstance(value, (TupleType, ListType)):
+        return [stringify(v) for v in value]
+    else:
+        return value
+
 
 # A new ServerProxy that also supports httpu urls.  An http URL comes in the
 # form:
@@ -91,8 +109,7 @@ class UnixTransport(xmlrpclib.Transport):
 
 # See _marshalled_dispatch below.
 def conv_string(x):
-    if (isinstance(x, types.StringType) or
-        isinstance(x, unicode)):
+    if isinstance(x, StringTypes):
         s = string.replace(x, "'", r"\047")
         exec "s = '" + s + "'"
         return s
@@ -169,8 +186,7 @@ class TCPXMLRPCServer(SocketServer.ThreadingMixIn, SimpleXMLRPCServer):
             # to transmit the string using Python encoding.
             # Thanks to David Mertz <mertz@gnosis.cx> for the trick (buried
             # in xml_pickle.py).
-            if (isinstance(response, types.StringType) or
-                isinstance(response, unicode)):
+            if isinstance(response, StringTypes):
                 response = repr(response)[1:-1]
 
             response = (response,)